Ultrafast carrier dynamics of metal halide perovskite nanocrystals and perovskite-composites
Perovskite nanocrystals (NCs), especially those based on cesium lead halides, have emerged in recent years as highly promising materials for efficient solar cells and photonic applications. The key to realization of full potential of these materials lies however in the molecular level understanding...
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| Published in | Nanoscale Vol. 11; no. 2; pp. 9796 - 9818 |
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| Main Authors | , , , , |
| Format | Journal Article |
| Language | English |
| Published |
England
28.05.2019
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| Online Access | Get full text |
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| Summary: | Perovskite nanocrystals (NCs), especially those based on cesium lead halides, have emerged in recent years as highly promising materials for efficient solar cells and photonic applications. The key to realization of full potential of these materials lies however in the molecular level understanding of the processes triggered by light. Herein we highlight the knowledge gained from photophysical investigations on these NCs of various sizes and compositions employing primarily the femtosecond pump-probe technique. We show how spectral and temporal characterization of the photo-induced transients provide insight into the mechanism and dynamics of relaxation of hot and thermalized charge carriers through their recombination and trapping. We discuss how the multiple excitons including the charged ones (trions), generated using high pump fluence or photon energy, recombine through the Auger-assisted process. We discussed the harvesting of hot carriers prior to their cooling and band-edge carriers from these perovskite NCs to wide band-gap metal oxides, metal chalcogenide NCs and molecular acceptors. How perovskites can influence the charge carrier dynamics in composites of organic and inorganic semiconductors is also discussed.
Studies on ultrafast dynamics of various photo-induced processes in perovskite nanocrystals and their composites, and insights obtained from them are presented in this review. |
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| Bibliography: | Navendu Mondal obtained his Ph.D. in June, 2018 under the supervision of Prof. Anunay Samanta at the School of Chemistry, University of Hyderabad. He obtained his Bachelor's degree in Chemistry from St Xavier's College Kolkata in 2010 and Master's degree (with specialization in Physical Chemistry) from the University of Calcutta in 2012. He is interested in studying photo-induced ultrafast processes in semiconductor nanostructures including perovskites and their various hybrid composites employing ultrafast spectroscopic techniques. Currently, he is a post-doctoral research associate at the Department of Physics, University of Texas at Dallas. Sumanta Paul is currently doing his Ph.D. under the supervision of Prof. Anunay Samanta. He obtained his Master's degree from the School of Chemistry, University of Hyderabad in 2017. His research focuses on the synthesis and study of photophysical properties of perovskite nanocrystals at the bulk and single-molecule level. http://chemistry.uohyd.ac.in/∼as/ Apurba De is currently a graduate student working with Prof. Anunay Samanta at the School of Chemistry, University of Hyderabad. He received his Master's degree in Chemistry in 2015 from the Ramakrishna Mission Vivekananda Centenary College, Kolkata. His current research interest lies in understanding ultrafast photoinduced processes in perovskite nanocrystals employing mainly femtosecond transient absorption measurements. Somnath Das is doing his Ph.D. with Prof. Anunay Samanta at the School of Chemistry, University of Hyderabad. He received his Master's degree from Indian Institute of Technology Indore, India in 2016. He is interested in developing highly luminescent all-inorganic and hybrid perovskite nanocrystals. Anunay Samanta is a Senior Professor at the School of Chemistry at the University of Hyderabad and a J. C. Bose National Fellow of the Department of Science and Technology, Government of India. He is at the University of Hyderabad since 1990 after obtaining his Ph.D. degree (1987) from Indian Association for the Cultivation of Science (Jadavpur University) and spending a little more than a couple of years as a postdoctoral researcher in the Radiation Laboratory, University of Notre Dame, USA. He is an elected Fellow of the Science Academies of India. He is a recipient of many national and international awards, which include the APA Award, Thomson Reuters India Citation Award, and Raman-Mizushima Lecture Award. His current research interests are ultrafast dynamics and single molecule fluorescence spectroscopy of all-inorganic perovskite nanocrystals and related materials. More details can be found at . ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
| ISSN: | 2040-3364 2040-3372 |
| DOI: | 10.1039/c9nr01745c |